Drupal 5 has been released so before anyone asks, yes Nuxified.org (as well as our sister site Libervis.com) will be upgraded to this latest and greatest release of Drupal at some point, but not today and not necessarily soon. It may happen in a few months time.
What are we waiting for is for all modules that we use to become available as stable releases for this new version. We also have to make sure that the customized theme which we use is compatible with Drupal 5.
When we are sure of that then we can make the move. Until then, Drupal 4.7 which we are on right now is serving us quite well, and will be supported for quite a while to come (in fact, even 4.6 is still supported).